A Waltham man was sentenced yesterday in federal court to nearly 20 years in prison for marijuana trafficking, federal prosecutors announced.

Anthony Saunders, 43, was convicted of conspiracy to distribute marijuana. U.S. District Judge Douglas P. Woodlock ordered him to serve 19 years and seven months in prison, followed by five years of supervised release, the U.S. Attorney's office announced.

Prosecutors said Saunders' mother, stepfather, and another man were also convicted in the case and sentenced to prison.

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